Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c6fc084fa266
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #23019 from RudyLu/keyboard/Bug1036796-switchingKey-styling

Bug 1036796 - [Keyboard] "ABC " and "12&" size need to be the same.
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/316958fcc086
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1036796 - [Keyboard] "ABC " and "12&" size need to be the same.
Bumping manifests a=b2g-bump